2012 Fiscal Year Final Research Report
Novel Vortex States and Phase Diagram in Multi-Component Superconductors
| Project/Area Number |
22540377
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
HU Xiao 独立行政法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, 主任研究者 (90238428)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 超伝導・密度波 / 鉄系とMgB2等の多成分超伝導 / 量子渦糸 / GL理論 |
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| Research Abstract |
In multi-component superconductors, phase differences among order parameters can take nontrivial values other than 0 and π, which breaks time reversal symmetry, when inter-component interactions are repulsive. In this novel state, more than two coherence lengths diverge at the critical temperature, making the dichroism classification of superconductors based on the Ginzburg-Landau (GL) parameter invalid. As such, novel vortex states are expected. Moreover, a mutual phase oscillation among components (known as Leggett mode) takes a small energy and thus can exist stably as a collective mode.
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